Spain electricity prices show high volatility between Saturday and Monday

Electricity prices in the Spanish market have shown significant volatility between Saturday, September 19, and Monday, September 21, 2026. On Saturday, the average wholesale price was reported at 110.26 euros per megawatt hour (MWh) by the Operador del Mercado Ibérico de la Energía (OMIE). During that day, prices reached a minimum of -0.92 euros/MWh between 14:00 and 15:00, before climbing to a peak of 198.78 euros/MWh during the late evening hours.

By Monday, September 21, prices for consumers on regulated (PVPC) or indexed tariffs saw a sharp increase. According to Red Eléctrica, the average price rose to 196.65 euros/MWh, representing a 39.13% increase compared to the previous Sunday. The most expensive period occurred between 20:00 and 21:00, with prices hitting 414.83 euros/MWh. The most economical window for consumption on Monday was between 14:00 and 15:00, when prices dropped to 18.10 euros/MWh.